You could see what they'd offer you for the Jeep as-is with the transmission for a trade. Then ask how much they'd give you if it was fixed and see if the difference in the trade is worth the cost of putting a used transmission in it. If you need to keep your payments where they are now, you'd probably be looking at an older vehicle to finance since you'd have to roll over the balance of your loan. Then you have to ask yourself if you want to finance an older vehicle where you could also have some "serious" problems if its higher mileage. Maybe you wouldn't have any issues. Tough to say.
2012 KK Sport, Mopar skids, DuraTracs, Mopar Grille Guard
98 ZJ Laredo SE 4.0, 2" Skyjacker BB, JKS Quicker Discos, Goodyear Wrangler MT/Rs, K&N FIPK, Kolak cat & back exhaust, Westin Safari bar, KC lights